fixed annoying bug in exclusion of informal names caused by fact that null values are "like" string values such as "informal"
fixed annoying bug in exclusion of informal names caused by fact that null values are "like" string values such as "informal"


paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new,paleobiodb/pbdb-new